--- zzzz-none-000/linux-2.4.17/net/ipv4/ip_output.c	2001-10-17 21:16:39.000000000 +0000
+++ sangam-fb-322/linux-2.4.17/net/ipv4/ip_output.c	2004-11-24 13:22:09.000000000 +0000
@@ -5,7 +5,7 @@
  *
  *		The Internet Protocol (IP) output module.
  *
- * Version:	$Id: ip_output.c,v 1.99 2001/10/15 12:34:50 davem Exp $
+ * Version:	$Id: ip_output.c,v 1.2 2003/11/06 19:01:58 aramesh Exp $
  *
  * Authors:	Ross Biro, <bir7@leland.Stanford.Edu>
  *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
@@ -187,6 +187,8 @@
 	skb->dev = dev;
 	skb->protocol = __constant_htons(ETH_P_IP);
 
+       *(__u32 *)skb->cb = skb->nh.iph->saddr;
+
 	return NF_HOOK(PF_INET, NF_IP_POST_ROUTING, skb, NULL, dev,
 		       ip_finish_output2);
 }